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A silicon NPN transistor is used and it has a large value of β. Find the required value of R2 when IC=1mA.

A silicon NPN transistor is used and it has a large value of β. Find the required value of R2 when IC=1mA. Correct Answer 40kΩ

For silicon, VBE=0.8V, VCE=0.2V. IC=VTH-VBE/RE. By pitting the values, we have VTH=1.3V. R2 can be found from, VCCR2/R1+R2. We get R2=40KΩ.

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